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The following commit(s) were added to refs/heads/camel-main by this push:
new 4387722c0a CAMEL-24369: openai: make the MCP client work in native mode
4387722c0a is described below
commit 4387722c0a8966b27df6916a6cc591e8d995c4ea
Author: Federico Mariani <[email protected]>
AuthorDate: Fri Aug 7 15:22:40 2026 +0200
CAMEL-24369: openai: make the MCP client work in native mode
The MCP client (mcpServer.* endpoint options) resolves its JSON mapper and
schema validator through java.util.ServiceLoader, and (de)serializes the
MCP protocol messages (McpSchema records) reflectively via Jackson. The MCP
Java SDK ships no native-image metadata, so a native application using MCP
tool calling failed at startup with
ServiceConfigurationError: No McpJsonMapperSupplier available, and after
registering the providers the client initialize handshake still failed on
the unregistered schema classes.
Register the two service providers and all indexed
io.modelcontextprotocol.spec / .json classes for reflection.
Co-authored-by: Claude Fable 5 <[email protected]>
---
.../openai/deployment/OpenaiProcessor.java | 41 ++++++++++++++++++++--
1 file changed, 39 insertions(+), 2 deletions(-)
diff --git
a/extensions/openai/deployment/src/main/java/org/apache/camel/quarkus/component/openai/deployment/OpenaiProcessor.java
b/extensions/openai/deployment/src/main/java/org/apache/camel/quarkus/component/openai/deployment/OpenaiProcessor.java
index 61cc735a7e..5667a8554d 100644
---
a/extensions/openai/deployment/src/main/java/org/apache/camel/quarkus/component/openai/deployment/OpenaiProcessor.java
+++
b/extensions/openai/deployment/src/main/java/org/apache/camel/quarkus/component/openai/deployment/OpenaiProcessor.java
@@ -35,6 +35,7 @@ import
io.quarkus.deployment.builditem.RemovedResourceBuildItem;
import
io.quarkus.deployment.builditem.nativeimage.NativeImageResourcePatternsBuildItem;
import io.quarkus.deployment.builditem.nativeimage.ReflectiveClassBuildItem;
import
io.quarkus.deployment.builditem.nativeimage.ReflectiveHierarchyBuildItem;
+import io.quarkus.deployment.builditem.nativeimage.ServiceProviderBuildItem;
import io.quarkus.deployment.pkg.steps.NativeOrNativeSourcesBuild;
import io.quarkus.jackson.deployment.IgnoreJsonDeserializeClassBuildItem;
import io.quarkus.maven.dependency.ArtifactKey;
@@ -51,8 +52,44 @@ class OpenaiProcessor {
}
@BuildStep(onlyIf = NativeOrNativeSourcesBuild.class)
- IndexDependencyBuildItem indexDependencies() {
- return new IndexDependencyBuildItem("com.openai", "openai-java-core");
+ void indexDependencies(BuildProducer<IndexDependencyBuildItem>
indexDependency) {
+ indexDependency.produce(new IndexDependencyBuildItem("com.openai",
"openai-java-core"));
+ indexDependency.produce(new
IndexDependencyBuildItem("io.modelcontextprotocol.sdk", "mcp-core"));
+ }
+
+ @BuildStep(onlyIf = NativeOrNativeSourcesBuild.class)
+ void
registerMcpSdkServiceProviders(BuildProducer<ServiceProviderBuildItem>
serviceProvider) {
+ // the MCP client (mcpServer.* endpoint options) resolves its JSON
mapper and schema
+ // validator through java.util.ServiceLoader; without these
registrations a native
+ // application fails at runtime with "No McpJsonMapperSupplier
available"
+ serviceProvider.produce(new ServiceProviderBuildItem(
+ "io.modelcontextprotocol.json.McpJsonMapperSupplier",
+
"io.modelcontextprotocol.json.jackson2.JacksonMcpJsonMapperSupplier"));
+ serviceProvider.produce(new ServiceProviderBuildItem(
+
"io.modelcontextprotocol.json.schema.JsonSchemaValidatorSupplier",
+
"io.modelcontextprotocol.json.schema.jackson2.JacksonJsonSchemaValidatorSupplier"));
+ }
+
+ @BuildStep(onlyIf = NativeOrNativeSourcesBuild.class)
+ void registerMcpSdkSchemaForReflection(
+ CombinedIndexBuildItem combinedIndex,
+ BuildProducer<ReflectiveClassBuildItem> reflectiveClass) {
+ // the MCP protocol messages (McpSchema records and friends) are
(de)serialized by Jackson
+ // reflectively; the MCP Java SDK ships no native-image metadata
+ Set<String> mcpSchemaClassNames = combinedIndex.getIndex()
+ .getKnownClasses()
+ .stream()
+ .map(ClassInfo::name)
+ .map(DotName::toString)
+ .filter(className ->
className.startsWith("io.modelcontextprotocol.spec")
+ ||
className.startsWith("io.modelcontextprotocol.json"))
+ .collect(Collectors.toSet());
+
+
reflectiveClass.produce(ReflectiveClassBuildItem.builder(mcpSchemaClassNames.toArray(new
String[0]))
+ .constructors()
+ .fields()
+ .methods()
+ .build());
}
@BuildStep(onlyIf = NativeOrNativeSourcesBuild.class)
